sample nodes and rels comma delim, now load as expected

Original sample example wasn't working for me. Once I made the nodes
and relationships comma separated as opposed to tab separated it
started working.

I used the nodes and rels found in the readme file

I turned on batch_import.csv.delim=, in the main and sample
batch.properties files

I set batch_import.keep_db=false because I was getting node-reuse
complaints